You can purchase a unit such as this,, but there are coshh considerations and I would think that it could be quite time consuming. On the other hand, there are platers out there...I haven't used these, so I can't make a personalrecommendation, but here are some Birmingham Jewellery Quarter one's turned up by google....

Perhaps if you go down this route you'd be kind enough to let everyone know how you got on.
Best of luck,
Tabby x